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Re: Measuring Castor on I-beam?
You are pretty much on the right track. The simple thing would be to run it on a front end machine and have it checked but that takes a few bucks in most places even if they don't do any work on it.
You could also use a magnetic angle finder
I picked this one up at ACE after the cover fell off the dial on my old one that I had for 30 years. You can get them at Sears, I think Home Depot or Lowes and Harbor Freight almost always has them in stock. Handy on any build.
The theory is exactly what you figured, finding out how many degrees the top of the axle is leaned back from center.
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Founding member of the too many projects, too little time and money club.
My ongoing truck projects:
48 Chev 3100 that will run a 292 Six.
71 GMC 2500 that is getting a Cad 500 transplant.
77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.
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